On warmers as the ionizing source in active galactic nuclei

Details On warmers as the ionizing source in active galactic nuclei On warmers as the ionizing source in active galactic nuclei

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..165c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 1, 1992, p. 165-176. Research supported by C

Statistics

Computation

39

Active Galactic Nuclei, Photoionization, Seyfert Galaxies, Star Clusters, Starburst Galaxies, Computational Astrophysics, H Ii Regions, Metallicity, Stellar Evolution, Stellar Winds

Scientific paper

The starburst-warmers scenario for type 2 Seyferts and LINERs is reviewed, and the Terlevich and Melninick result that warmers may indeed power the narrow-line spectrum in these nuclei is confirmed. It is concluded that warmers can be the ionizing source in many narrow-line AGN, although the coverage of AGN areas diagrams is not complete. The warmers model is found to be successful within a metallicity range between 0.5 and 2 solar-Z. The upper limit is set by the strong cloud cooling by forbidden lines. At Z less than about 0.5 solar-Z fewer stars would be thrown into warmer phases due to the smaller mass-loss rates, and even if warmers occur the emission-line spectrum would correspond to an H II galaxy rather than to AGN. Attention is also given to the chemical pollution of the gas by the strongly processed stellar winds of massive stars. It is suggested that the nitrogen overabundance of AGN arises quite naturally in this scenario.

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